Daniel Dove, who was Tasered while naked in police custody, has spoken about his ordeal.
PC Lee Birch, 30, discharged his weapon into the bare chest of Mr Dove in a cell at Melksham police station in the early hours of December 23, 2012.
He had arrested Mr Dove, a carpenter, outside MooMoo nightclub, in Trowbridge, following an altercation with a clubber.
In the cell, PC Birch unholstered his Taser and concealed it behind his back, while two other officers began a strip search.
When naked Mr Dove, 24, of Timbrell Street, Trowbridge, flicked his boxer shorts at PC Birch, and the officer then Tasered him.
PC Birch was found not guilty of any wrongdoing on Tuesday after a five-day trial at Bristol Crown Court.
Mr Dove spoke out after police CCTV footage showing him being Tasered was released to the media.
He said: “I’m angry with the verdict and I’ve lost my faith in the justice system.
“The jury saw the video, which shows I wasn’t particularly aggressive towards him, and I just don’t see how they let him off as it is surely an abuse of PC Birch’s power as a police officer.
“When I was Tasered it felt like I’d touched a really strong electronic cattle fence, only much, much worse.
“I was on the ground in shock and none of the officers even helped me up. They left me there.”
Mr Dove admitted that he was annoyed at being arrested and was under the influence of alcohol in custody, but did not believe he did anything to warrant being Tasered.
The jury heard that Mr Dove punched PC Birch in the head during his arrest, before kneeing another police officer in the groin three times.
He was charged with being drunk and disorderly and assaulting two police officers, though the case against him was later dropped.
PC Birch still faces an Independent Police Complaints Commission inquiry into the incident.